Five brothers bought a gift for their mother’s birthday.
The cost of the gift was 150 dollars.
Moses gave 80 dollars,
So Moses' contribution = $80
Daniel gave 21 dollars,
So Daniel's contribution = $21
Anthony gave 20%,
Since 20% of $150 = (0.20)×($150) = $30,
So Anthony's contribution was $30
Lucas gave 18 dollars
So Lucas' contribution was $18
and Mark paid the rest. How much was Mark´s contribution?
We add the contributions from Moses, Daniel, Anthony and Lucas:
$80 Moses
21 Daniel
30 Anthony
+18 Lucas
----
$149 Total contribution from other four besides Mark
Then we subtract
$150
-149
----
$ 1 the amount Mark contributed, just one dollar!
Edwin